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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd18f542a20270d41028b9ab7ebadf761f1cf713e1ab818fc4693acee902f56' 
  AND token = 'BXQqQHWZxV8mlCu4z6u9mHaeM3gm8vfDp/B81RjjkHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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