SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6524a3c0bfe896fa772991820bfbe67bb91f2481e9c2b4e10d894e2c2d641c2e' 
  AND token = 'WgqVUR8fqxwQ1TKjQ0HbUh6DUmH1T2BvAJV5Y5LMBfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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