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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465e25e6f33b08ee83a6b30007ba5e1d6364e181156d8a0c63eeb81903f51a27' 
  AND token = 'dQ5jktpeOxDI3/e+D8J9xm4VNrOy+elVI+qoioZ7WQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}