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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21d7e10eedd6a9c2af4c4935464a4a38a8d3dbf5851becf4e6ff0322a56e826' 
  AND token = '+bH7tD115z9wCUgOpw4W82ShNX6feSnJ6gTIilccz0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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