SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080dfcabe8323bbd8e23e196dc32ca3f6752117fd9428be4b7001414792e595f' 
  AND token = 'yFiFGYR/EJCS51y5GPCX9Pxrqj+pFT79ZuCCjO22BLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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