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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6795d22c0dfa5f10df0d55d1ffbb2ed953f2be494d98ae05fe6e600ec5ef1349' 
  AND token = 'nhsM+LagRTc2ia7ZBTcf67CCXQkbW8FVlDk3GjulvMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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