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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b4663ab7c4cddbf2682aa6a1103d47ec86cf7ce21505ac10ebe7aa4e327bbb' 
  AND token = '73vOMGJC5Le4T+tRQ+uVLMO9Vk4eKWDgZ1XMdM+ILsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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