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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b149cc10ecfbac0910a7872811c9fec83afdccaa28ce69186ad8546347d946' 
  AND token = '0rh6ihpjwcaYtHM9Rmwx7VuSrK6dT6y99ep667P0nEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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