SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97f5f0dbfb857477a2bc0ad73fea101509c2d61596e250386370e36c815e59a' 
  AND token = 'jZqR+zj3wH8PIRQYgL/4qPuC9pQLHr9KuFPTJViWmj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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