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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0909c725c19df625fa4eef8a4a03ffe737d9a64fea36f53ab6a8ab242b91a6' 
  AND token = 'qqjbbmS9+jMkCwxNqe+2WSSHcOWrE4/LI6wbCorquI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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