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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e6add41d7d82bcbdbce10e5a111a6a2f30125d70ad04f7eddb4e9fd552237f' 
  AND token = 'dpdc1fAcw+gaTFlauBwxzdYFOaIwRCUkDTNfb/b9QjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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