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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e104448d834e78f31c364d77c0eaa8c78642665dc4e33bd3003d8553e2cc339' 
  AND token = 'dj5O9nqWWWKYHt6JaGaXvXqdN6Sj1nfxrHtHUMz75MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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