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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468fdee73a44d2ca71296f7fbb89bf9f43869eadfb8a4c509c95fd26d7202ff2' 
  AND token = 'jX/ssd8yF+jx+B60wNbLZr8xkd010yjbCoUtj5wMZks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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