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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853d173908b29fb6664eb89e39094d9c778bd6e689cd83f907b52aa3359480b8' 
  AND token = 'yLlOziMEBL5wuRUn97K6jGJrmzbkLvtbfiZP5ES83xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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