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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627d1fe85ccc7e4728bfab8eaf94b4bb6dbe1aad0209e69930eb0c0824579200' 
  AND token = 'EfKWhJGzTmJdopuIJYqhJ4c9Ckl1mg24V5J2W2iLZ2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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