Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a3562245339683655d2c328cc008cee79c63458a633abd04086d1914f29be5' 
  AND token = 'hC8sVESd3HCd/6HpIlsp9JwioIwMTVM5/D2KwS1hqWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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