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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a707d91eaf198e786f9f2a53ee7be93df8a56e6c9acaa2d0b8de976e5bb18487' 
  AND token = 'xkof6IBqKGnl1s0JNf94HSBjtJigkf94ReOe0mOys78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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