SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9168e9f6b5f3193e2cb5983f6ef8121ac7e1382a45df225fcf6c9e0bd4245712' 
  AND token = 'vLD0TLhZY+8GKEYZVN4pWwz6mRjxGjptMNePIm3TNNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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