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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b1c924a346534b8078e33d47bee576b6ba2b3e09d1f85171e520a7b7c3e53e' 
  AND token = '1ryLBB6e7S9woCPStYBGcHjPCdNlHnbCyqAVZl+mUmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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