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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6747febe63a423b14e366b8b9f278f400d81b65897dffa0f949796cd4c802d0' 
  AND token = '2jN2T9V8sr9h5OUwQnDvIzn6P0OLeFnIe1lCBFjJQ2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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