SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70d9005bcd76b5426508f1362494f380b27ef96f1f29fd9d5d9cfa734695f36' 
  AND token = 'zQahBA0moKG9zPT9DZk/gUcQlpvZqwg5v+l1l7dMRhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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