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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79bf51a2db4bd67a06b89040c321ff523d7c0e05b68a92a5c7fe19714b27709' 
  AND token = '8BWcoGQ7+OgDu5GlvRkWcVWcbE5JXvAY/QQPp/Tk1p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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