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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fe97221e77286a237ae3ece183a3e3a322c9d05aec0e0c3794451eba6dac38' 
  AND token = 'K6yVX0DnRqQxlY3Z7phcCGIoYHnqhmgZDSQ5WPzdb+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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