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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b8c56d9db0936c6bca40b7c87390029e865502611691e9ac22b53c584a7251' 
  AND token = '//AkYIZF5mdmyuci5je4tnxsyqMNbz8T/6CmL4W4OXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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