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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30763c1af52d3da45f0b218f19aff5bded3df00df3d51c20a3c0faad6a98586f' 
  AND token = '8dE6+Lc5EwAFHuMZTR/Z10a+KzpwyQLzX04V1pQXxGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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