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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69954ef60e614e5bf336c3e56aab92e833edbf49ac28ab204391a03711cc76b5' 
  AND token = 'q0nEgCzcFa+wNJZJdZqcp2Tq8kXKGh2THjmk1Swue9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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