SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca49286876e38f366c54274847c54afbcfd699ebd1a22958595cf2038792233' 
  AND token = 'gazB6UPg/VXjB5X0LX+4hpeMJow2m/as4GIWW95Yin8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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