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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7ed2f59b469018e2c73c0853d07a011ebe64bd48d7fc93a9a5b2d26c3c207c' 
  AND token = 'nrz9fAg3sso4FTYayJHgjL5GdIiCtRnQsK2hlNU7WEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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