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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc510d7c257c4fccf52058413a58f6f1f8b35ae11f96ca976f4b4bc22ec03be3' 
  AND token = 'mI8VyFXsuD2PVrJ5p4cuCdmhakkczEj9FvrwNuosEs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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