Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0498f44f1f6d61138d75104bb3fb214929f225896ec741673e65e053df9dfb58' 
  AND token = '10bSaGxpRxu02OuytI4MjaYPQWipC0MEG2mQuJFSpSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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