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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b55af8e8efd9289e4f693c0eee384975cb9a15568f43d9d13e6ab29883a4323' 
  AND token = 'D7RBW+bUS7/o9vwDuZsamShGJIDM/MHXUkI7cA2D+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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