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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2608498dbddb8b74e038addb5517cbd36bfbf34a71d6e35818ee2ac08399a7ee' 
  AND token = 'NkkSugWBwNu/MpH/lvR0sgUXqNrCcwgopS1lWx56aRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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