SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e057d513c16f0b6be4deaca27bdd014068c938e5fdf1ba8f75c8182c8b1db1c9' 
  AND token = 'vwTnM+BVsW4NNQzVscPwYUjgwj72cxGkNE+6zNH9HjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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