SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771c185354c272d34a90c5268fb241aaee1c9c1d65790410934bc4731876ecfb' 
  AND token = 'wHvcnbJmOOAopQG7rEVXVp5uoWROjUn0YxRwY+6RXzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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