SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59455fe07b16e10a1fd08decb1f37e8956f2d3529345d6a3be9c3c1ffe8e91b1' 
  AND token = 'TcsKBUGxVBKUAIqpUZhIijG4eXg0hraMCGYnPPC9Hyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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