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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd5fc2053c5020021ed4e2ea3d5fb405aaa0924822b3bf096a6f2fd5aad12f9' 
  AND token = 'yYNctxo9ZJThVPh5UHYX96IIu8kyJDaIsXiEFt8oJfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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