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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67191a936b2a325d8b91cb5993b7c38d42d497815142c772ae1b3b13b174f16' 
  AND token = '0sq7M5/5x33UuO99WB/pFvc1aMpl7PYv/NvlvMxm/Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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