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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5807b743c25a6ee1299a88994a15cc024f5fd643c68e94defae8562822db72' 
  AND token = 'XfAbGiGTT/ikGI7hBJwmQ6MoiejV3G7pVrcGB5QsNd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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