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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681cf5fc0ff6a5f094b681fdb192b28c69f18e95a833617d2798ebde51f500c5' 
  AND token = 'G8A/kN13irPz9hgzABtyHloZKyd+lSxONaTZxU6aP/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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