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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936e80b042bdc8127e6b280e70f102cc5816b28b02a02204273a4cad4a265337' 
  AND token = 'uEj9+fx8V0timc7xfJVZ6trqGpsdqKFstpb0aQn2YwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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