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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbef3549bac70fa94e698066ac06f7c53be09863030f511491de5a8f9a4f8d36' 
  AND token = 'LhgYQxXSqEfiM2EJ6IuidPSY9j+JNYJ0I4hCEbmMqrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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