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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073e42672eb57bec86e6188b467e6bfc2d83acfbd7389e086bc67bedcda18ff3' 
  AND token = 'UJSBieuJsHcsa1siS7iKn18ym6Q5OY6mWKoMqVuM1sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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