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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7166757824a2239bcda610adc242229fd449c4d809a33deb64787fed868132' 
  AND token = 'dAHj37eUMNEpyLaACAAj7gFWE8G82Rks+cicvYaxRiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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