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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20672fb46cec49201b62db78cb272dae4b53dbee7f7cb3850acc3960d8e44b41' 
  AND token = 'tP6yF9xNxerT81aHzmNAQHrXGO+L6z4vyxuLYb/5tF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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