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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a959d375694dba4c2d60a92ecbe5cdc1be19aee341274b2b017ebe550a6ca761' 
  AND token = 'SaPiLQr2X2Vf/qCUO/nG2EUve8xbIS4aBfeU1YjHYXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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