SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702e040fac86677c4aeabd9c9a656bcf62ad1788e32a99ddabcbe61223198fb7' 
  AND token = 'GzHy+UvRPfMLlYDZqF/Zlhuqt8VWVihlX9nvQeD1ZkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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