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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ea64fba745aa58b9cc552db9656dc5cd15712e4a96a80b9de7a179f8b67ece' 
  AND token = 'FT1ftzFS+gs2eYenz1qlJxK94VgTcm5lWCCZxmpzBqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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