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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03fd284295fed873b2d16f6abeda5c05cc9ec31d31fc4a8ee884657c6a804dd' 
  AND token = 'N2Ud1Nue7RSMiC+hT04P7Aj610J8FXvsMQ/OydTRUpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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