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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03743f136bc57daf64db5bf6b279016cb77390013f2e423ccdde5c691912d78d' 
  AND token = 'evBuAx31iWN5rjxVcjGZcvOa2C2HWN29fGP+6RvcmSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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