SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8872059c1df408b32cd5ababa5231317854262c2bbb2ddbc3d7ee1f8b6f29762' 
  AND token = 'HZGUPo7r+2yUnaPQuhPVVwQGtZ0gppvDa22rZHjVZkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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