Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18d141c3a212096d891c1d41a1faf896ea0f08a9ed94f00d2e18811c08c6753' 
  AND token = 'VBDfEP8laL+oDm3tLlFqtAQytz6myVIeR4yJ6PJLHXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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