SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6330abf3f8e6659ec7ae679611d86445b2db2dbf4b5b1532c13eff88fb91dc' 
  AND token = 'O4GlNJDy09BnwRElZgwWKGqztjdS3fMLPXcVnE7veU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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