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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609920af4d0c719e2d43e2582fcfa16e61e6c87e3e28d93b4ff136584e17ef1f' 
  AND token = 'qo07H5Q7PYpnGvb4WbvHAs5XGOgd2YI7FngDxwGwFNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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