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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc462827892564b57e08a9612e683196df4c512a438f4a77811bb4d3450819c' 
  AND token = 'dy62UIiO7fAX2bakjMCSqrvsE8YtXIxIJ4eP6O9EhDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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