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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3716d6a57fefe67a1fd5a98819e216ea8160d815173081478b063fa0f60de5ec' 
  AND token = 'XjNeQtd7fWl/fRc0Dq5A5y/5U6yNj6kX+80xDsLoE+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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