SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11409f380342d657192670c972bea0e0771fcae03d52b6840dacdf5f42a6e118' 
  AND token = 'OAJM2PAnUz9qKCQ1Xk/juPZv+iuxFigQsrefawI0BCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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