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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb04431cdc557d7d33e8b71ada404d71f4a4c2013c42060eaa492f1f6733d39' 
  AND token = 'LUa6j9vcJb/oACYBEF89jbErj4iEJic2jJD2Fru70gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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