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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdace75e93d2c82c629664a7c0d5c5bbdd0b6018f0631229b4cf07597df11d7' 
  AND token = '/BRtLOfWe9hF8fGB9gLG0opfdQAdPvdEHiQb1mcsty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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