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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68ea85099b72c932d8039af6bf3d83da94dffe0c4ca6a92937b76e693916b35' 
  AND token = 'A8zDrBV1YXrlcA6s8sJ6Ra9OQ9j04jQananjuLIXzsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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