SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f819a33c198a465ac8b301c8696095fb649f6e241c3391c261d61fe5492530b' 
  AND token = 'wigjFlpRi/aCjhPseWhk/tqOdTgGz7aCdmddJgAWYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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