SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fef022a39682af4a91f45b6f5b1870cd366f8c31d8003eeb6221f82df729c05' 
  AND token = 'Lh2KfNXOQ9vAwor6phFhulYr58TaSEsrsGSX/u/gVhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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