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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173ee4f7eb829e02cc2b2017acddead9e588ee2e1f48088f2bee64847ae48611' 
  AND token = 'zK6pssReRpKmUMeAaiTc6VkeBpPxhTO3PNmePQku45Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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