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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c274d3ff6ad651d4ee96e77317c7c8d78720fee96c17b8a3be8e8c0ffed6ace' 
  AND token = 'kR4d7P83nxV9aKHnUcHKIzxbTB75N8OaLYTsz/283Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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