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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e210f55e2a5dacd439c958f62a50f36cfe42068751dcd4679529f07160018f' 
  AND token = '0zGbN/ymw75NSTeiX62KL7ZFz9q1dBSneCo24KXqFyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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