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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4011e67bbf96cb551fc2968a6f43f72efd84e94cd6882a79e2f881b35ba47deb' 
  AND token = 'l8ENr/i3XSyIH6odqhw3Eo/sZ5tCz+cigI36NzbMhOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00150

JSON explain

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