SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118fa823b21327ec2f4f79b168f56a8c961e9649c9fd74a244d7257702858e06' 
  AND token = 'Yl4axj8o9mbitJp3Nrl4XC4UF9w2FSvGkIgK/TbZaoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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